2025 Peterbilt 389 TSBs
24 Technical Service Bulletins across 7 categories
Engine
9 bulletinsAn exhaust manifold slip joint seal kit is now available for EPA 2017-2024 PACCAR MX-13 engines.
This optional software update is now available for chassis equipped with EMY 2021B-2023 PACCAR MX-11 and MX-13 engines.
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This update provides customers with additional time to service their trucks before a DEF-related derate occurs. The software is being offered to customers in alignment with recently updated regulatory agency guidance.
"An optional software update will be available on 07/06/2026 for chassis equipped with EMY 2021B-2023PACCAR MX-11 and MX-13 engines.
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This update provides customers with additional time to service theirtrucks before a DEF-related derate occurs. The software is being offered to customers in alignment withrecently updated regulatory agency guidance."
Certain EPA21 PACCAR MX engines are equipped with PHINIA fuel injectors that do not meet PHINIAs manufacturing...
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specifications.
EPA17-24 MX Fuel Injector Connector - This bulletin has been revised to include all EPA17-24 and CARB24 PACCAR MX...
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engines.
Procedure pictures updated for clarity.
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When troubleshooting Cummins X15 fault codes 555 or 556, follow this additional testing, inspection, and documentation procedure to help identify the root cause of dusted engines. This is not a stand-alone process but must be used alongside Cummins troubleshooting steps. Cummins Quickserve will reference this bulletin for fault codes 555 or 556.
Newly designed fuel injectors are available for EPA2021 compliant PACCAR MX-series engines to optimize engine performance.
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Injectors must be replaced as a full set (6 injectors) and associated software must be updated at the same time.
"Vehicles equipped with PACCAR MX engines with Engine Software Version NA202 or NA206 may display a dash STOP lamp incorrectly.
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PCI-2 software on these chassis must be reverted from NA202 to NA201 (Pack 2 injectors) or from NA206 to NA191 (Pack 1 injectors) to prevent incorrect STOP lamp display.
FIX-AS-FAIL Updated to include EPA2024 compliant engines.
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Fuel Filters must be changed before first cleaning. EPA2021 injector cleaning is referenced in RMI for certain injector faults. Complete the procedures in E290. Discard any previous versions of E290 procedures always use the most current document from the link in the bulletin.
Software & Calibration
8 bulletinsThe verbiage in the Introduction section has been updated.
The Condition, Chassis Affected, Service Action, Warranty, and Procedure sections have been updated to include the...
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latest prognostics bulletin verbiage. The Warranty section has also been updated to include Peterbilt specific SRT codes for filing cross-division repairs.
"The software is not yet available.
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The bulletin will be updated when more information is available."
"KW: A new recommended repair has been added to verify the software level and close the campaign in SIR.The repair...
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procedure has been updated with additional note boxes for clear instructions. PB: The repair procedure has been updated with additional note boxes for clear instructions."
(KW) Certain T680 / T800 / T880 / W900 / W990 have updated GHG labels available for order and installation.
EMY21-25 GHG Label Replacement (KW) Certain T680 / T800 / T880 / W900 / W990 have updated GHG labels available for order and installation.
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(PB) Certain Model 367 / 389 / 567 / 579 / 589 have updated GHG labels available for order and installation.
(KW) Certain T680 / T800 / T880 / W900 / W990 have updated GHG labels available for order and installation.
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(PB) Certain Model 367 / 389 / 567 / 579 / 589 have updated GHG labels available for order and installation.
As of 03/25/2025, this campaign has resumed.
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Software updates are now available to complete this campaign.
Transmission
3 bulletinsUpdated Sheppard Steering Gear Classification Tool link in Inspection Procedure
Fix As Fail Approximately 150 chassis built with an Allison 6th Gen 4500 series 6-speed transmission were assembled with...
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the incorrect transmission harness. A procedure to re-pin transmission harness has been developed. Fix-as-Fail start date is 09/18/2024.
This Bulletin contains parts ordering and replacement procedures for Steering Gears identified as SUSPECT under 24PBC ONLY.
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Steering Gears repaired under this bulletin MUST be entered into the Serial Number Tracking Form for 24PBC.
Other
1 bulletin"Kenworth: Dealers should check the chassis list and SIR weekly for VIN changes.
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2 chassis added to the chassis list. Peterbilt: Dealers should check the chassis list and SIR weekly for VIN changes. 10 chassis added to the chassis list."
Electrical
1 bulletinThe procedure has been updated to include additional steps for verifying the software level on the vehicle electronic...
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control unit (VECU2) and digital display (DD). Steps have also been added to the PACCAR Common Rail Injection 2 (PCI2) software verification.
Fuel System
1 bulletin32 fuel injector part numbers (16 for MX-11 and 16 for MX-13) have been added to this warranty policy.
Brakes
1 bulletinSafety Recall Updated software and procedures are now available.
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Certain Vehicle Model Year 2021-2025 Peterbilt chassis configured for trailer towing require a software update for the Bendix EC80 ABS ECU. Software update procedures for certain Battery-Electric Vehicles (BEV) and EC80 ABS ECU part numbers are not yet available. This bulletin will be updated when software update procedures are available for these chassis. Safety Recall publish date: 1/10/25